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tests/_support/Config/TestRegistrar.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Tests\Support\Config;
+
+/**
+ * Class Registrar
+ *
+ * Provides a basic registrar class for testing BaseConfig registration functions.
+ */
+class TestRegistrar
+{
+    public static function RegistrarConfig()
+    {
+        return [
+            'bar' => [
+                'first',
+                'second',
+            ],
+            'format' => 'nice',
+            'fruit'  => [
+                'apple',
+                'banana',
+            ],
+        ];
+    }
+}